September in Đồng Hới averages a daily high of 30.8°C with nights around 24.2°C. Expect roughly 14.8 wet days totalling 490.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Đồng Hới is January–April.
Based on DONG HOI, VM (2.8km), 1995–2024. 19 years of September data.